Hi,
Given the table keyval(key int(11), val int(11)), I would like to be
able to retrieve the keys for which a row exist for given X values.
Example:
key value
1 8
1 9
1 10
2 8
3 8
3 10
4 8
4 9
4 10
4 11
Given values 8, 9, 10 the query should thus return 1 and 4. The possible
number of values is variable.
Can this be expressed somewhat more elegantly than multiple EXISTS
subqueries?
SELECT DISTINCT key FROM keyval outer
WHERE EXISTS (SELECT * FROM keyval inner
WHERE outer.key = inner.key
AND inner.val = 8)
AND EXISTS (SELECT * FROM keyval inner
WHERE outer.key = inner.key
AND inner.val = 9)
...
Br,
Morten